Do you have trouble with the filesystem is corrupt?
Do you get a message with something like the image below?
Remember this can differ from every situation so, one problem might be very different from any others, in my case I did not have any backup so I did not have so much as a choice just go for it and cross my fingers.
You will need to run fsck on the entire link that the system is complaining about.
It might be that you need to make a choice I picked Yes
I had to do this two or three times, but every time the filesystem link changed.
But after that I was lucky and the system was working again.